There are definitely sites that sell FLAC. I don't recall them because I very rarely by music (considering YouTube is basically free). But I've gotten FLAC versions of various albums from more niche markets like Nine inch Nails and Saul Williams who were trying to pioneer alternative music distribution and high-fidelity music (I've got With Teeth in 24-bit/192 KHZ DVD audio).
But niche bands aside, I know there are sites out there. FLAC is the new vinyl. Amazon may even let you buy certain digital downloads in FLAC format.
OH, many Humble Bundles and TONS of GOG games include FLAC versions of audio. System Shock 2, Slave Zero, etc. Good stuff. I'm a huge fan of game soundtracks and I literally just listened to a Deus Ex song not five minutes ago. I find game music to be very exciting and--unlike songs with lyrics--open to interpretation. You can literally close your eyes while listening to the beautiful Moscow Symphony Orchestra playing the soundtrack to Outcast, and imagine you're anywhere. A miriade of different adventures. Something about that music, whether inherent, or merely nostalgic (a reminder of simpler times when all you cared about was the next game to play at the LAN party and running out of soda), I'm not sure. But I like it.
Come to think of it, perhaps those lack of lyrics also help not affect my ADD/ADHD. I have trouble focusing and the beats seem to help, but when lyrics come in (especially with new songs I haven't heard before) the lyrics become a distraction--like a person in the room trying to have a conservation with me while I work.
But that's getting far off-topic. So forgive my bout of introspection.
As for Neil: Come on man. I know you're an elder (;)) and I respect the perspective that comes with age, but certainly you must know that vinyl recorders were SAMPLED at a specific frequency range, and each PHYSICAL component also has a frequency response range. So, it may be more pleasing to the ear to have the special errors introduced by traditional vinyl equipment (which still hasn't been A/B blind proven AFAIK), but they physically cannot have a higher quality.
What your hearing is likely more nostalgia than anything. The warmth of remembering your first record, listening next to family members, physically playing around with the buttons, etc.
You can't have a higher quality than what you start with. If the recording chain (mic to pre-amp to amp to mixer to recorder) has any limitations at any point, it becomes a least common denominator. The worst part controls the limits of the mix. And we've NEVER lived at a time where equipment has been as high quality for that cheap. People in their basements have better recording systems than Van Hahen and Elvis ever had access to.
There WAS a time where digital sounded WAY WORSE than analog and you had to choose between the configuration and power of digital, verses the quality of analog. But those days went away with the end of the 80's. When digital samples were so low bitrate they actually combined them with analog signals to create their sounds. (e.g. The Roland MT-32 was actually a prosumer musicians card--not a game soundtrack machine. The samples were complete crap quality by today's standards but they were combined with an FM module so that the digital sample played the start of the "instrument" and faded out into an FM which held the sustain or faded away.)
Really, if you want great sound, grab a pair of good (not expensive... just good) headphones and plug them in. Even crappy SNES music sounds twice as good when you create a controlled environment for your ears. (That is, headphones know the space your ears will be in, while speakers sound different in every room and even if you add a piece of furniture.)
 Holy crap, I didn't realize how much I wrote. Man, I miss my music writing days and the free spirit of youth before I had "a mortgage" to think about.